Europe has had wars. Stop pretending otherwise. The fact that you don't even consider for a second the Yugoslav War or the Ukraine conflict when talking about war and peace in Europe shows just how much you care about the rest.
For what it matters, the entire world is more peaceful than ever. Ignore the Middle East for a second and the world looks so fantastically peaceful. That's because it is.
It's not because of the European Union. It's because we have weapons that can destroy every inch of life on the planet if major countries went to a major war with one another.
The idea that without the EU, France and the UK or Germany would go at it is just comically ridiculous. They don't have disputes that are nearly severe enough to trigger a war. They'd rather secure their prosperity than to go to war over things like their former emperors and kings did. We don't live in those times.
The EU didn't end warfare. It simply came at a time when everybody knew that major wars would result in the end of the globe. Like, why would Germany want to go to war with a nuclear power like France or Russia? It would be annihilated.
You should thank the nukes, not the EU.
Your silly project will die and you need to come to terms with it. Nobody really likes it. Even us in Eastern Europe hate you very badly. We'd rather join up with Russia one day (and we will) and have our own union rather than be with Germans and what have you.